package org.gary.core.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Map;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;


public class ValidateNumImageManagerAction extends ActionSupport {   
	/**
	 * 
	 */
	private static final long serialVersionUID = -4417393341361070466L;

	public void makeImage() throws Exception {
		  Map<String, Object> session = ActionContext.getContext().getSession();
		  HttpServletResponse res = ServletActionContext.getResponse();
		  BufferedImage img = new BufferedImage(68, 22,
		    BufferedImage.TYPE_INT_RGB);

		  // 得到该图片的绘图对象

		  Graphics g = img.getGraphics();

		  Random r = new Random();

		  Color c = new Color(200, 150, 255);

		  g.setColor(c);
		  // 填充整个图片的颜色
		  g.fillRect(0, 0, 68, 22);
		  // 向图片中输出数字和字母

		  StringBuffer sb = new StringBuffer();

		  char[] ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();

		  int index, len = ch.length;

		  for (int i = 0; i < 4; i++) {

		   index = r.nextInt(len);

		   g
		     .setColor(new Color(r.nextInt(88), r.nextInt(188), r
		       .nextInt(255)));

		   g.setFont(new Font("Arial", Font.BOLD | Font.ITALIC, 22));// 输出的字体和大小

		   g.drawString("" + ch[index], (i * 15) + 3, 18);// 写什么数字，在图片的什么位置画

		   sb.append(ch[index]);

		  }

		  session.put("piccode", sb.toString());

		  ImageIO.write(img, "JPG", res.getOutputStream());

		 }

		}